The crazed brother of a condemned killer sent to the gas chamber swears vengeance on those he holds responsible for his brother's execution.

A mad doctor uses patients at his isolated psychiatric institute as subjects in his attempts to create longevity by surgically installing an artificial gland in their skulls.

The first musical comedy from the Grand National assembly line, Hats Off stars John Payne and Mae Clarke as rival press agents Jimmy Maxwell and Jo Allen. Both have been assigned to stir up publicity for separate expositions at the 1936 Texas Centennial (newsreel footage of which predominates throughout the film's short running time). To throw Jimmy off the track, Jo pretends to be a schoolteacher, but by the time the ruse has been revealed, the two leading characters have fallen in love.

An Eskimo Army Sergeant is sent to his Arctic tribal village to gather information about a mysterious unmarked black airplane which shadows military planes in northern Alaska and equally-mysterious flashings lighting up the sky from Siberia across the Bering Strait. He soon discovers Soviet espionage at work. Along the way he must also deal with an ice-floe evacuation, an air-ice rescue, a fight with a polar bear and marriage to his fiancee.